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<?php

namespace Aws\S3\Crypto;

use \Aws\Crypto\MetadataStrategyInterface;

use \Aws\Crypto\MetadataEnvelope;

class HeadersMetadataStrategy implements MetadataStrategyInterface

{

    /**

     * Places the information in the MetadataEnvelope in to the metadata for

     * the PutObject request of the encrypted object.

     *

     * @param MetadataEnvelope $envelope Encryption data to save according to

     *                                   the strategy.

     * @param array $args Arguments for PutObject that can be manipulated to

     *                    store strategy related information.

     *

     * @return array Updated arguments for PutObject.

     */

    public function save(MetadataEnvelope $envelope, array $args)

    {

        foreach ($envelope as $header=>$value) {

            $args['Metadata'][$header] = $value;

        }

        return $args;

    }

    /**

     * Generates a MetadataEnvelope according to the metadata headers from the

     * GetObject result.

     *

     * @param array $args Arguments from Command and Result that contains

     *                    S3 Object information, relevant headers, and command

     *                    configuration.

     *

     * @return MetadataEnvelope

     */

    public function load(array $args)

    {

        $envelope = new MetadataEnvelope();

        $constantValues = MetadataEnvelope::getConstantValues();

        foreach ($constantValues as $constant) {

            if (!empty($args['Metadata'][$constant])) {

                $envelope[$constant] = $args['Metadata'][$constant];

            }

        }

        return $envelope;

    }

}